docs: def encrypt_file(file, keys=secretKeys()):
      '''Encrypt file data with the same method as the Send browser/js client'''
      key = keys.encryptKey
      iv = keys.encryptIV
      encData = tempfile.SpooledTemporaryFile(max_size=SPOOL_SIZE, mode='w+b')
      cipher = Cryptodome.Cipher.AES.new(key, Cryptodome.Cipher.AES.MODE_GCM, iv)
  
      pbar = progbar(fileSize(file))
  
      for chunk in iter(lambda: file.read(CHUNK_SIZE), b''):
          encData.write(cipher.encrypt(chunk))
          pbar.update(len(chunk))
  
      pbar.close()
      encData.write(cipher.digest())
      file.close()
  
      encData.seek(0)
      return encData